Fig. 1From: Staged cervical osteotomy:a new strategy for correcting ankylosing spondylitis thoracolumbar kyphotic deformity with fused cervical spinea Preoperative X-ray. TK, PT, PI, and SVA were 93.8°, 32.9°, 39.2°, and 259.0 mm, respectively. The total kyphosis of the spine (T4–L3) was 106.4°. b Preoperative clinical photographs showing the patient with thoracolumbar kyphoscoliosis. His chin-brow vertical angle was 21°Back to article page